<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0 user-scalable=no">
    <title>Document</title>
    <!--显示logo图-->
   <link rel="shortcut icon" href="../img/logo.png" type="images/x-icon"/>
   <script>
       //声明变量
       let msg ='hello web19!'
       console.log(msg)
       document.write(mag)
       document.write('<h1>这是第一次的js课程！</h1>')
   </script>
</head>
<body>
    <!--//1-->
    hello
    
</body>
</html>